Here is the course of events:
I tried the usual:
Looking at the little "window" at the back where all the metabolic readings are done, there seems to be sign of humidity inside it ...
I'm very disapointed ... this watch is it not supposed to be water resistant?
I only got it less than 2 years ago.
I'm very sad as I love the watch ...
What can I do from here?
I've contacted the support as suggested (thanks for the tip).
But ... what a surprise ... they want me to put the watch in the rice for 24hours before doing anything else ...
I mean ... a sport watch, less than 2 years old, does not boot ... and the support answer is, for now, let's put it in rice to see what happens.
Again, what is making me sad is that I really love that watch, I'm using it everyday to train.